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From Wikipedia:

Topaz

Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al2SiO42. It is used as a gemstone in jewelry and other adornments. Topaz in its natural state is a golden brown to yellow. A variety of impurities and treatments may make topaz wine red, pale gray, reddish-orange, pale green, pink, or opaque... Read More

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